<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh +'px'}">
        <block v-for="(item,i) in cateList" :key="item.cat_id">
 <view :class="['left-scroll-view-item',item.cat_id === active?'active':'']" @click="activeChanged(item)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh +'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="item2.cat_id">
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title">{{ item2.cat_name }}</view>
          <!-- 三级分类 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="item3.cat_id" @click="gotoGoodsList(item3)">
              <!-- 三级分类的图片 -->
              <image :src="item3.cat_icon.replace('dev','web')" mode=""></image>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix]
    ,
    data() {
      return {
        //当前设备可用高度
        wh: 0,
        //分类列表的数据
        cateList: [],
        active: 0,
        //二级分类的列表
        cateLevel2:[],
        scrollTop: 0
      };
    },
    onLoad() {
      // 调用api获取设备信息
      const sysInfo = uni.getSystemInfoSync()
      //获取设备可用高度
      this.wh = sysInfo.windowHeight-50
      
      //调用方法获取分类列表数据
      this.getCateList()
    },
    methods:{
      //获取分类列表的数据
      async getCateList(){
        const {data: res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        //为1级分类赋值
        this.cateList = res.message
        //单机高亮赋id
        this.active = this.cateList[0].cat_id
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      //单机改变高亮并为分类赋值
      activeChanged(item){
        this.active = item.cat_id
        //重新为二级分类赋值
        this.cateLevel2 = item.children
        //二级分类滚动条设置为0
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      //跳转到商品页面
      gotoGoodsList(item3){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item3.cat_id
        })
      },
      // 跳转到搜索商品
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;
      
      .left-scroll-view-item{
        background-color: #F7F7F7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;
        
        &.active{
          background-color: #FFFFFF;
          position: relative;
          
          &::before{
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #00857d;
            position: absolute;
            top: 50%;
            left: 0;
            transform: translateY(-50%);
          }
        }
      }
    }
    .cate-lv2-title{
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
    }
    .cate-lv3-list{
      display: flex;
      flex-wrap: wrap;
      .cate-lv3-item{
        width: 33.33%;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        margin-bottom: 10px;
        image{
          width: 60px;
          height: 60px;
        }
        text{
          font-size: 12px;
        }
      }
    }
  }
</style>
